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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, net of shares for tax withholdings (in shares)			14,633
Weighted average fair value of options granted (in dollars per share)				$ 3.70	$ 3.51
Unrecognized compensation cost related to nonvested stock options granted	$ 813			$ 813
Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost charged against income	99	$ 98		$ 359	$ 299
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in the period (in shares)			22,716	4,008
Shares withheld for tax withholding obligation (in shares)			8,083
Award vesting period						5 years
Unrecognized compensation expense	$ 23			$ 23
Expected period for recognition				1 year 2 months 12 days
Fair value of shares vested				$ 85	$ 71
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected period for recognition				2 years 10 months 9 days
Maximum percentage of stock granted				15.00%
Maximum number of shares issued and outstanding (in shares)				1,500,000
Contractual term				10
Stock Options | Share-based Payment Arrangement, Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				5 years
Stock Options | Share-based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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